noun
a small endocrine gland in the brain that produces and regulates hormones such as melatonin
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The pineal gland is a small endocrine gland located in the brain that produces melatonin.
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I heard that the pineal gland is responsible for regulating our sleep-wake cycle.
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They say the pineal gland is like our body's internal clock.
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Some believe the pineal gland is the 'third eye' that connects us to spiritual realms.